i dont know if its a bug but this one u just need to "reach" the stage with rank S, when i tried to beat it on normal after credits i got rank A in this stage (i received too much damage) and still got this one

13 Apr
3:14 2019

MrGauss edited this achievement.

13 Apr
22:00 2019

Refined the logic: the achievement wasn't unlocking in a given situation.